fix(tui): silence noisy provider refresh warnings during startup

[liruifengv]

Related Issue

No linked issue.

Problem

Startup runs a best-effort background refresh of every provider's model list. Transient failures — being offline, an expired OAuth token, or a custom-registry entry this client does not yet recognize — surfaced a warning on every launch (Skipped refreshing ... in the status area and a [custom-registry] Skipping invalid entry ... console warning). These are not actionable and add noise to each startup.

What changed

• The startup background refresh no longer shows per-provider failure warnings. The manual refresh in the model picker still reports failures when the user asks for it.
• Custom registries now skip unrecognized entries quietly instead of logging a console warning.
• Updated the affected tests to cover the new silent behavior and added a changeset.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: f6a7cb5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@f6a7cb5

npx https://pkg.pr.new/@moonshot-ai/kimi-code@f6a7cb5

commit: f6a7cb5